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AD9949 Datasheet(PDF) 21 Page - Analog Devices |
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AD9949 Datasheet(HTML) 21 Page - Analog Devices |
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21 / 36 page  AD9949 Rev. B | Page 21 of 36 HORIZONTAL CLAMPING AND BLANKING The AD9949’s horizontal clamping and blanking pulses are fully programmable to suit a variety of applications. Individual sequences are defined for each signal, which are then organized into multiple regions during image readout. This allows the dark pixel clamping and blanking patterns to be changed at each stage of the readout to accommodate different image transfer timing and high speed line shifts. INDIVIDUAL CLPOB AND PBLK SEQUENCES The AFE horizontal timing consists of CLPOB and PBLK, as shown in Figure 21. These two signals are independently programmed using the parameters shown in Table 18. The start polarity, first toggle position, and second toggle position are fully programmable for each signal. The CLPOB and PBLK signals are active low and should be programmed accordingly. Up to four individual sequences can be created for each signal. INDIVIDUAL HBLK SEQUENCES The HBLK programmable timing shown in Figure 22 is similar to CLPOB and PBLK. However, there is no start polarity control. Only the toggle positions are used to designate the start and the stop positions of the blanking period. Additionally, there is a polarity control, HBLKMASK, which designates the polarity of the horizontal clock signals H1 to H4 during the blanking period. Setting HBLKMASK high sets H1 = H3 = low and H2 = H4 = high during the blanking, as shown in Figure 23. Up to four individual sequences are available for HBLK. 3 2 1 HD CLPOB PBLK PROGRAMMABLE SETTINGS: 1. START POLARITY (CLAMP AND BLANK REGION ARE ACTIVE LOW). 2. FIRST TOGGLE POSITION. 3. SECOND TOGGLE POSITION. ACTIVE ACTIVE ... ... Figure 21. Clamp and Preblank Pulse Placement 2 1 HD HBLK PROGRAMMABLE SETTINGS: 1. FIRST TOGGLE POSITION = START OF BLANKING. 2. SECOND TOGGLE POSITION = END OF BLANKING. BLANK BLANK ... ... Figure 22. Horizontal Blanking (HBLK) Pulse Placement Table 18. CLPOB and PBLK Individual Sequence Parameters Parameter Length Range Description Polarity 1b High/Low Starting Polarity of Clamp and PBLK Pulses for Sequences 0 to 3 . Toggle Position 1 12b 0 to 4095 Pixel Location First Toggle Position within the Line for Sequences 0 to 3 . Toggle Position 2 12b 0 to 4095 Pixel Location Second Toggle Position within the Line for Sequences 0 to 3 . Table 19. HBLK Individual Sequence Parameters Parameter Length Range Description HBLKMASK 1b High/Low Masking Polarity for H1 for Sequences 0 to 3 (0 = H1 Low, 1 = H1 High). Toggle Position 1 12b 0 to 4095 Pixel Location First Toggle Position within the Line for Sequences 0 to 3. Toggle Position 2 12b 0 to 4095 Pixel Location Second Toggle Position within the Line for Sequences 0 to 3. Toggle Position 3 12b 0 to 4095 Pixel Location Third Toggle Position within the Line for Sequences 0 to 3. Toggle Position 4 12b 0 to 4095 Pixel Location Fourth Toggle Position within the Line for Sequences 0 to 3. Toggle Position 5 12b 0 to 4095 Pixel Location Fifth Toggle Position within the Line for Sequences 0 to 3. Toggle Position 6 12b 0 to 4095 Pixel Location Sixth Toggle Position within the Line for Sequences 0 to 3. |
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